// For flags

CVE-2021-21787

 

Severity Score

8.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

A privilege escalation vulnerability exists in the way IOBit Advanced SystemCare Ultimate 14.2.0.220 driver handles Privileged I/O write requests. During IOCTL 0x9c40a0d8, the first dword passed in the input buffer is the device port to write to and the byte at offset 4 is the value to write via the OUT instruction. The OUT instruction can write one byte to the given I/O device port, potentially leading to escalated privileges of unprivileged users.

Se presenta una vulnerabilidad de escalada de privilegios en la forma en que el controlador IOBit Advanced SystemCare Ultimate versión 14.2.0.220, maneja las peticiones de escritura de I/O con Privilegios. Durante IOCTL 0x9c40a0d8, el primer dword pasado en el buffer de entrada es el puerto del dispositivo para escribir y el byte en el offset 4 es el valor para escribir por medio de la instrucción OUT. Un atacante local puede enviar un IRP malicioso para activar esta vulnerabilidad

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-01-04 CVE Reserved
  • 2021-07-07 CVE Published
  • 2024-08-03 CVE Updated
  • 2024-08-03 First Exploit
  • 2024-12-17 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-782: Exposed IOCTL with Insufficient Access Control
CAPEC
References (1)
URL Tag Source
URL Date SRC
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254 2024-08-03
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Iobit
Search vendor "Iobit"
 Advanced Systemcare Ultimate
Search vendor "Iobit" for product "Advanced Systemcare Ultimate"
 14.2.0.220
Search vendor "Iobit" for product "Advanced Systemcare Ultimate" and version "14.2.0.220"
-
Affected